Global Patent Index - EP 2579207 A2

EP 2579207 A2 20130410 - Method of noise reduction in digital x-ray frames series

Title (en)

Method of noise reduction in digital x-ray frames series

Title (de)

Verfahren zur Rauschverringerung bei digitalen Röntgenrahmenserien

Title (fr)

Procédé de réduction du bruit dans des trames de rayons x numérique série

Publication

EP 2579207 A2 20130410 (EN)

Application

EP 12186390 A 20120927

Priority

EA 201101502 A 20111007

Abstract (en)

A distinctive feature of the suggested method of noise reduction of digital x-ray image series is that frame-by-frame estimation of signal-dependent noise variance involves morphological deletion of pixel values of noise image corresponding with edges of the initial frame. Tabular dependence of the noise on signal intensity is obtained with the use of robust piecewise-linear approximation of interval estimations of noise variance. A noise map is computed as a pixel-by-pixel estimation of noise variance of the initial digital image. While estimation and compensation of motion and flicker-effect a pyramid scheme for the block correspondence search is applied. Motion estimation blocks are considered overlapped, while motion compensation the block overlappings are averaged by applying a flat weighting window. Flicker-effect compensation is implemented by division of the reference- and current frames by appropriate frames of of average values , which are obtained by LF-filtration of the given frames. To compensate flicker-effect the local average intensity of the reference frame is reduced to the local average intensity of the current frame, wherein the reference frame is divided by its motion-compensated frame of average values and multiplied by the frame of average values of the current frame. Recursive averaging providing motion compensation artifacts correction involves mixing of the current filtered frame with its initial version based on the computation of pixel and structural similarity of the given frames.

IPC 8 full level

G06T 5/00 (2006.01); G06T 5/50 (2006.01)

CPC (source: EP KR US)

G06T 5/00 (2013.01 - KR); G06T 5/50 (2013.01 - EP US); G06T 5/70 (2024.01 - EP US); G06T 2207/10016 (2013.01 - EP US); G06T 2207/10116 (2013.01 - EP US); G06T 2207/20016 (2013.01 - EP US); G06T 2207/20021 (2013.01 - EP US); G06T 2207/20036 (2013.01 - EP US); G06T 2207/20182 (2013.01 - EP US); G06T 2207/20201 (2013.01 - EP US); G06T 2207/20216 (2013.01 - EP US); G06T 2207/30101 (2013.01 - EP US)

Citation (applicant)

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Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 2579207 A2 20130410; EP 2579207 A3 20130710; CN 103177423 A 20130626; EA 017302 B1 20121130; EA 201101502 A1 20121030; JP 2013127773 A 20130627; KR 20130038794 A 20130418; US 2013089247 A1 20130411

DOCDB simple family (application)

EP 12186390 A 20120927; CN 201210371952 A 20120928; EA 201101502 A 20111007; JP 2012216792 A 20120928; KR 20120110554 A 20121005; US 201213645518 A 20121005